Impact of data model and point density on aboveground forest biomass estimation from airborne LiDAR

Table 4 Two-sided Wilcoxon signed rank test results of the plot size effect on LiDAR metrics for the Sierra Nevada Mountains study site

Sierra Nevada Mountains, California
Point density (points m⁻²)	Plot size (ha)	AUCW		CV		FC		Max-H		MeanH		P25H		P50H		P75H		P90H		StdH
Point density (points m⁻²)	Plot size (ha)	E-B	CHM	E-B	CHM	E-B	CHM	E-B	CHM	E-B	CHM	E-B	CHM	E-B	CHM	E-B	CHM	E-B	CHM	E-B	CHM
Original	0.09–0.25	–	–	✓	✓	–	–	✓	✓	–	–	–	✓	–	–	–	–	–	–	✓	✓
	0.09–0.50	–	–	✓	✓	–	–	✓	✓	–	–	✓	✓	–	–	–	–	–	–	✓	✓
	0.09–1.00	✓	✓	✓	✓	✓	–	✓	✓	–	✓	✓	✓	–	✓	–	–	✓	–	✓	✓
10 points	0.09–0.25	–	–	✓	✓	–	–	✓	✓	–	–	✓	✓	–	–	–	–	–	–	✓	✓
	0.09–0.50	–	✓	✓	✓	–	–	✓	✓	–	–	✓	✓	–	–	–	–	–	–	✓	✓
	0.09–1.00	✓	✓	✓	✓	✓	–	✓	✓	–	✓	✓	✓	–	✓	–	–	✓	–	✓	✓
5 points	0.09–0.25	–	–	✓	✓	–	–	✓	✓	–	–	✓	✓	–	–	–	–	–	–	✓	✓
	0.09–0.50	–	✓	✓	✓	–	–	✓	✓	–	–	✓	✓	–	–	–	–	–	–	✓	✓
	0.09–1.00	✓	✓	✓	✓	✓	–	✓	✓	–	✓	✓	✓	–	✓	–	–	✓	–	✓	✓
1 points	0.09–0.25	–	✓	✓	✓	–	–	✓	✓	–	–	–	✓	–	–	–	–	–	–	✓	–
	0.09–0.50	–	✓	✓	✓	–	–	✓	✓	–	–	✓	✓	–	–	–	–	–	–	✓	–
	0.09–1.00	✓	✓	✓	✓	✓	–	✓	✓	–	✓	✓	✓	–	✓	–	–	✓	–	✓	✓

The reference plot size for the comparison was that used for the field plot measurements (0.09 ha)
– indicates no significant differences, ✓ indicates significant differences (significance level: 5%), E-B echo-based data model, CHM canopy height model, AUCW area under canopy waveform, CV coefficient of variation, FC fractional cover, Max-H maximum canopy height, Mean-H mean canopy height, P25H 25th height percentile, P50H 50th height percentile (median height), P75H 75th height percentile, P90H 90th height percentile, StdH standard deviation of the height

ISSN: 1750-0680